1 files changed, 92 insertions, 0 deletions
diff --git a/src/sq/sq_result_helper.c b/src/sq/sq_result_helper.c
new file mode 100644
index 000000000..ef36d3e90
--- /dev/null
+++ b/src/sq/sq_result_helper.c
@@ -0,0 +1,92 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file sq/sq_result_helper.c
+ * @brief functions to initialize parameter arrays
+ * @author Jonathan Buchanan
+ */
+#include "platform.h"
+#include <sqlite3.h>
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_sq_lib.h>
+#include "taler_sq_lib.h"
+#include "taler_amount_lib.h"
+
+
+/**
+ * Extract amount data from a SQLite database
+ *
+ * @param cls closure, a `const char *` giving the currency
+ * @param result where to extract data from
+ * @param column column to extract data from
+ * @param[in,out] dst_size where to store size of result, may be NULL
+ * @param[out] dst where to store the result
+ * @return
+ *   #GNUNET_YES if all results could be extracted
+ *   #GNUNET_SYSERR if a result was invalid (non-existing field or NULL)
+ */
+static int
+extract_amount_nbo (void *cls,
+                    sqlite3_stmt *result,
+                    unsigned int column,
+                    size_t *dst_size,
+                    void *dst)
+{
+  struct TALER_AmountNBO *amount = dst;
+  const char *currency = cls;
+  if ((sizeof (struct TALER_AmountNBO) != *dst_size) ||
+      (SQLITE_INTEGER != sqlite3_column_type (result,
+                                              (int) column)) ||
+      (SQLITE_INTEGER != sqlite3_column_type (result,
+                                              (int) column + 1)))
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  GNUNET_strlcpy (amount->currency, currency, TALER_CURRENCY_LEN);
+  amount->value = (uint64_t) sqlite3_column_int64 (result,
+                                                   (int) column);
+  uint64_t frac = (uint64_t) sqlite3_column_int64 (result,
+                                                   column + 1);
+  amount->fraction = (uint32_t) frac;
+  return GNUNET_YES;
+}
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param currency the currency to use for @a amount
+ * @param[out] amount where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_SQ_ResultSpec
+TALER_SQ_result_spec_amount_nbo (const char *currency,
+                                 struct TALER_AmountNBO *amount)
+{
+  struct GNUNET_SQ_ResultSpec res = {
+    .conv = &extract_amount_nbo,
+    .cls = (void *) currency,
+    .dst = (void *) amount,
+    .dst_size = sizeof (struct TALER_AmountNBO),
+    .num_params = 2
+  };
+
+  return res;
+}
+
+
+/* end of sq/sq_result_helper.c */